It can be very scary particularly when it's a thick numbness that you can't function with. Most of the time, it's not that bad and it happens fast...one minute you feel like you're about to lose it and the next you're numb and and a weird sense of calmness comes over you. I'd prefer not doing it or having more control over it, but it has also saved me from many serious issues. Last year, when the event that brought me to PC was occurring, I disassociated the better part of the day for a month straight. It was better than the alternative: SI and thoughts of suicide. But since then, my body just seems to do it whenever it feels me get anxious over anything and I need to stop it.